The ebooks are available directly from the Pottermore shop. The Pottermore website (interactive exploration of the Harry Potter books), is now open for everyone to join as it was previously available under limited invites only.

Once purchased you can download the books up to 8 times, either direct to the PC or via a number of ebook providers (eg. Amazon / Google Play etc.). Hopefully in future all ebooks will be available like this or at least available as DRM free downloads in multiple formats that Smashwords and some other ebook publishers already provide.

The convenience of being able to download all the ebooks onto my Kindle, which is far easier than carrying around the print version (especially some of the later books), combined with the fact that I can view this on my Android Tablet, Android smartphone, Kindle and Linux laptop convinced me to buy these ebooks even though we have a set of hardback versions on our books shelf. It will make them much easier to read when I'm travelling.